The invention relates to a method, a testing arrangement, a testing device, an 8B/10B encoder and an 8B/10B decoder, with which the recovery from a 8B/10B encoding error of a device using serial data transmission may be tested. The 8B/10B encoder (302) according to the invention in a transmitting device (30) may create code words unspecified in the ANSI INCITS 203-1994 standard for testing. The 8B/10B decoder (312) in a receiving device (31) is able to indicate having converted a code word unspecified in the ANSI INCITS 203-1994 standard and having entered a testing mode. The testing device (33) connected to the receiving device commences monitoring of the receiving device (31), when the 8B/10B decoder (312) pertaining to it indicates the system having entered the testing mode.
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